Have always used Eset 64-bit on my Win7 64-bit PC...No intrusions, or unecessary silly alerts all the time as with some others, and the Virus Bulletin results speak for themselves (virusbtn.com). I compared Eset against all the major contenders, and it passed on all levels, where others dropped a catch here and there.

At different times and on different machines, I've used Norton Antivirus, McAfee, Microsoft Essentials, AVG free antivirus and maybe more. All with LR4 and Win 7 64-bit, as well as earlier versions of LR and earlier versions of Windows. Not encountered any problems relating to Lightroom.

My concern was the help info for LR4 indicsated there was soome issues with Norton. i needed to get away from the "bloatware" scenario. was able to acquire "McAfee total protection" and so far so good. thanks

Thanks Dave, very helpful response. i guess i should of waited a day for the emails to come in. i was able to get a sale on McAfee. bough it, installed it and so far so good. if there will be any issues, i'll be the first to jump on the band wagon to complain.\Thanks